helper.cpp

/*
 *  helper.cpp
 */

/*
 * Copyright (c) 2015, James Fowler
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files
 * (the "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to permit
 * persons to whom the Software is furnished to do so, subject to the
 * following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#include "helper.hpp"

// *************************************************************************

namespace Helper {

void string_repr_out::write_on(std::ostream &o) const {
  o << "\"";
  const char *cp = s.c_str();
  const char *end = cp + s.size();

  while (cp < end) {
    switch (*cp) {
    case '\n':
      o << "\\n";
      break;
    case '\r':
      o << "\\r";
      break;
    case '\0':
      o << "\\0";
      break;
    case '\t':
      o << "\\t";
      break;
    case '\\':
    case '\'':
    case '\"':
      o << "\\" << *cp;
      break;
    default: {
      unsigned char c = *cp;
      if (c < 32) {
        unsigned char hi = '0' + (c & 0x0fu);
        unsigned char lo = '0' + ((unsigned char)(c >> 4u) & 0x0fu);
        o << "\\x" << hi << lo;
      } else {
        o << c;
      }
    }
    }
    cp++;
  }

  o << "\"";
}

} // namespace Helper

// *************************************************************************